A student researcher performed a chromatographic separation of caffeine and aspartame. The retention time for caffeine, tc, was found to be 207.9 s with a baseline peak width, wc, of 13.9 s and the retention time for aspartame, ta, was 264.2 s with a baseline peak width, wa, of 22.2 s. The retention time for the unretained solvent methanol was 47.0 s. Calculate the average plate height in micrometers for this separation, given that it was performed on a 16.8-cm long column.

During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 89.0 n/m. if the hose is stretched by 5.80 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length? unitst 3 number-1497 the tolerance is +/-5% open show work click if you would like to show work for this question:

Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)

Which governments provide garbage collection services to homes and businesses